Improvement in dies for making hollow rings



, V s. BUTT-LE. v V Dies for Making Hollow Rings.

N0.158,914. t lan.l9,l87,5.

ATTORNEY/S. I

"as the die O is withdrawn.

UNITED STATES PATENT OFFIGE- SHUBAEL OOTTLE, or new YORK, n. Y., ASSIGNOR TO MULFORD, HALE &

OOTTLE, on SAME rLAcn.

IMPROVEMENT lN DIES FOR MAKING HOLLOW RINGS.

Specification'forming part of Letters Patent No. 158,914, dated January 19, 1875; application filed October 10, 1874.

To all whom't't may concern:

Be it known that I, SHUTBAEL Oor'rLE, of the city, county, and State of New York, have invented a new and useful Improvement in Forming Circular and Oval Hollow Rings of which the following is a specification:

Figures 1 to 8, inclusive, represent the dies and tools for performing the successive steps of the operation. Fig. 9 represents a completed ring.

Similar letters of reference indicate corresponding parts.

My invention has for its object to produce circular and'oval hollow rings from a disk of sheet metal, and without any cross-seam, for use in manufacturing chains, buttons, studs, and other articles of jewelry.

The invention will first be fully described, and then pointed out in the claim.

A represents a circular gold plate, which fits into a rabbet or recess in the face of the die B, and which is forced through the cavity I of the said die B by the die 0, bringing it into cup shape. The lower part of the cavity of the die B is enlarged, as shown in Fig. 1, so that the blank may readily drop through it The cup shaped blank A as it comes from the dies B O, is

\ placed upon the die D, through the cavity of which it is forced by the die E. has a shoulder, 6, formed upon it, of the same The die E thickness as the gold plate being operated upon, and which cuts or pinches oif the upper part of the cupshaped blank A against the sides of the die D as the said blank is forced through. The lower part of the cavity of the die D is enlarged, forming a shoulder, d, which acts as a stop to push the blank A from the die E as the said die is withdrawn. The blank A as it comes from the second operation, is placed upon the holder F, upon which it fits snugly, and its upper edge is turned off, the said holder serving as a gage,

and a hole is then drilled in the center of the said blank. The blank A is removed from the holder F, and is placed upon its edge in the cup-shaped cavity of the die Gr, and is operated upon by the die H,the face of which is ooncaved to fit upon the convex side of the blank A, and is provided with a center-pin, h, to enter the hole in said blank and hold it in position while being operated upon. This operation bends the edge of the blank A inward, producing the blank A The blank A is placed edge downward upon the face of the die I, which has a semi-cylindrical ring-groove formed in it, of such a diameter that the blank A may rest upon the face of the said die I upon the inner side of the said groove. The blank A is then operated upon by the die J. The face of the die J has a semi-cylindrical ringgroove formed in it, of the same diameter as the groove of the die I, and concentric with it. with a center=pin, j, which enters the hole in the blank A and thus holds it exactly in position while being operated upon by the dies I J. The effect of the dies I J is to roll the edge of the blank A inward and force down the convex body of the blank, forming a tubular ring around the said edge, and producing the blank A The die J is then removed, and the blank A", while still upon the die I, is operated upon by the die K, the face of which is so formed as to fit into the blank A and bring its tubular edge to a sharp angle with its flat center, forming the blank A". The blank A is then operated upon by the tool L, which operates as a crown-saw and cuts out the flat center of the blank A lea"- ing the blank in the form of a tubular ring, A The tubular ring A is then placed in a semi cylindrical ring-groove in the face of the die M, and is operated upon. by the die N,

which has a corresponding semi-cylindrical ring-groove formed in its face. The efl'ect of this operation is to true the ring A by reducin g any imperfections there may be in it, and thus produce a perfect hollow or tubular ring without any cross-seam. The dies, blanks, and ring have been described and shown in the drawing as being circular; but oblong or oval rings may be formed by giving the proper shape to the dies.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The' combination of the dies, holder, and cutting-tool B O, D E, F, G H, I J, I K, L, and M N, constructed as described, and operated successively, and in connection with each other, for forming tubular rings without cross'seams from flat metallic disks, substantially as herein shown and described.

/ SHUBAEL OOTTLE.

Witnesses:

JAMES T. GRAHAM, T. B. MOSHER.

The face of the die J is also provided. 

